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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Real estate and development in process, net $ 15,886,276 $ 15,817,194
Mortgage and notes payable 4,328,464 4,449,734
Other liabilities 517,428 578,969
Total liabilities and equity 18,875,160 20,162,251
Carrying value of the Company's investments in unconsolidated joint ventures 180,149 126,084
Unconsolidated Joint Ventures [Member]
    
Schedule of Equity Method Investments [Line Items]    
Real estate and development in process, net 1,014,663 924,297
Other assets 182,905 163,149
Total assets 1,197,568 1,087,446
Mortgage and notes payable 753,692 749,732
Other liabilities 23,180 28,830
Members'/Partners' equity 420,696 308,884
Total liabilities and equity 1,197,568 1,087,446
Company's share of equity 208,125 154,726
Basis differentials (27,976) [1] (28,642) [1]
Carrying value of the Company's investments in unconsolidated joint ventures $ 180,149 $ 126,084
[1] This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.